WO2020044690A1

WO2020044690A1 - Display device and method for producing display device

Info

Publication number: WO2020044690A1
Application number: PCT/JP2019/021397
Authority: WO
Inventors: 大原　宏樹
Original assignee: 株式会社ジャパンディスプレイ
Priority date: 2018-08-31
Filing date: 2019-05-29
Publication date: 2020-03-05
Also published as: JP2020035704A; JP7150527B2; CN112640578A; US20210184171A1

Abstract

The present invention provides: a display device which decreases the risk of the occurrence of a crack and a cleavage in a sealing film; and a method for producing a display device. A display device that has a display area in which an image is displayed, a first peripheral area which is arranged outside the display area, and a second peripheral area which is arranged outside the first peripheral area, said display device comprising an inner dam which is arranged in the first peripheral area that is positioned between the display area and the second peripheral area, an outer dam which is arranged outside the inner dam in the first peripheral area, a resin part which is formed between the inner dam and the outer dam so as to be higher than the inner dam and the outer dam, and a sealing film which is arranged so as to overlap with the display area when viewed in plan. The outer edge of the sealing film on the second peripheral area side is positioned above the resin part or the outer dam.

Description

Display device and method of manufacturing display device

The present invention relates to a display device and a method for manufacturing the display device.

(4) In a display device such as an organic EL display device, a display element may be deteriorated by impurities such as moisture entering the inside. In order to prevent entry of the impurities, for example, a sealing film in which an inorganic film and an organic film are stacked is provided.

方法 As a method of forming an organic film included in the sealing film, a method of arranging and curing a liquid resin is known. At this time, a dam agent is provided to prevent the liquid resin from overflowing from a predetermined area (see Patent Documents 1 to 3 below).

ＣＶＤ Also, as a method for forming an inorganic film included in the sealing film, a CVD method is known. At this time, the inorganic film may be formed in a predetermined region using a mask (see Patent Documents 4 to 9 below).

US Patent Application Publication No. 2015/0228927 US Patent Application Publication No. 2014/0132148 US Patent Application Publication No. 2015/0380685 JP 2008-038178 A JP 2016-003383 A JP 2016-003384 A JP 2011-076759 A JP, 2017-150017, A JP 2012-031473 A

When forming a sealing film by a CVD method using a mask, the sealing film is formed in a state where the mask is separated from the substrate. This is to prevent various films on the substrate from being damaged by contact with the mask. At this time, the sealing film forming material may flow from the gap between the mask and the substrate, and the sealing film may be formed up to the edge of the substrate. If there is a subsequent step of cutting the substrate itself along the cut line, cracks may occur in the sealing film, and the reliability of the display device may be reduced.

In recent years, in particular, a thin display device may be manufactured using a flexible substrate so as to be capable of bending. Even when the sealing film is formed by a CVD method using a mask, if the alignment accuracy between the mask and the substrate is low or if the material of the sealing film adheres between the mask and the substrate, the film may be curved. A sealing film is formed in a region to be sealed. When the sealing film is formed in the curved region, cracks and cracks may occur in the sealing film, and the display element may be deteriorated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device and a method of manufacturing the display device in which the risk of cracks and cracks in the sealing film is reduced.

One embodiment of the present invention is a display having a display region for displaying an image, a first peripheral region disposed outside the display region, and a second peripheral region disposed outside the first peripheral region. An apparatus according to claim 1, wherein the inner dam is disposed in the first peripheral area between the display area and the second peripheral area, and the outer dam is disposed outside the inner dam in the first peripheral area. And, between the inner dam and the outer dam, a resin portion formed higher than the inner dam and the outer dam, and a sealing film disposed so as to overlap the display region in plan view, An outer edge of the sealing film on the second peripheral region side is located on the resin portion or the outer dam.

Another aspect of the present invention is a method of manufacturing a display device having a display area for displaying an image and a first peripheral area disposed outside the display area, wherein the first peripheral area includes a dam. Arranging an agent, patterning the dam agent to form an inner inner dam and an outer outer dam, and between the inner dam and the outer dam, higher than the inner dam and the outer dam. Forming a resin portion, arranging a mask having an edge on the resin portion, and forming a sealing film in the display region; and forming the display device in a region outside the first peripheral region. And bending the.

It is a figure showing roughly the display concerning an embodiment of the present invention. FIG. 2 is a schematic diagram schematically illustrating a pixel circuit and a peripheral circuit. It is a figure for explaining the relation between a large board and an individual substrate. FIG. 4 is a diagram for explaining a IV-IV cross section of the display device. FIG. 5 is a diagram for explaining a VV cross section of the display device. FIG. 6 is a diagram for explaining a VI-VI cross section of the display device. FIG. 7 is a diagram for explaining a VII-VII cross section of the display device. FIG. 8 is a diagram for describing a VIII-VIII cross section of the display device. It is a figure for explaining a curved display. It is a figure for explaining the modification in which the cover resin was provided. It is a figure for explaining another modification provided with cover resin. 5 is a flowchart illustrating a method for manufacturing a display device. FIG. 7 is a diagram for describing the method for manufacturing the display device. FIG. 7 is a diagram for describing the method for manufacturing the display device.

各 Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate changes while maintaining the gist of the invention, which are naturally included in the scope of the present invention. In addition, in order to make the description clearer, the width, thickness, shape, and the like of each part may be schematically illustrated as compared with the embodiment, but this is merely an example, and the interpretation of the present invention is not described. It is not limited. In the specification and the drawings, components similar to those described in regard to a drawing thereinabove are marked with like reference numerals, and a detailed description is omitted as appropriate.

Further, in the detailed description of the embodiments of the present invention, when defining the positional relationship between a certain component and another component, “above” and “below” are located directly above or directly below a certain component. In addition to the case, unless otherwise specified, it includes the case where another component is further interposed therebetween.

FIG. 1 is a plan view showing an example of the display device 100 according to the embodiment. An example of the display device 100 is an organic EL display device.

The display device 100 includes a display area 102, a first peripheral area 104, and a second peripheral area 106. Specifically, the display area 102 is configured by pixels including a light emitting area. In the display area 102, for example, pixels configured by combining a plurality of unit pixels (sub-pixels) of red (R), green (G), and blue (B) are arranged in a matrix. The pixel displays a full-color image.

The first peripheral area 104 is arranged outside the display area 102. Specifically, the first peripheral area 104 is disposed on both sides of the display area 102 in the X and Y directions. In addition. The X direction is a horizontal direction in the drawing, and the Y direction is a vertical direction in the drawing. The second peripheral region 106 is provided at at least one position outside the first peripheral region 104. In the present embodiment, the second peripheral region 106 is provided below the first peripheral region 104 and is curved as shown in FIG.

The display device 100 includes an inner dam 108, an outer dam 110, a resin part 112, a touch sensor, a terminal part 122, an FPC 124, and a driving IC 126. The inner dam 108 is disposed in the first peripheral area 104. Specifically, the inner dam 108 is arranged at least in the first peripheral area 104 located between the display area 102 and the second peripheral area 106. In the embodiment shown in FIG. 1, the inner dam 108 is arranged in the first peripheral area 104 so as to surround the display area 102.

The outer dam 110 is arranged outside the inner dam 108. Specifically, the outer dam 110 is arranged outside the inner dam 108 at least in the first peripheral area 104 located between the display area 102 and the second peripheral area 106. In the embodiment shown in FIG. 1, the outer dam 110 is disposed so as to surround the inner dam 108 in the first peripheral region 104.

The resin portion 112 is formed between the inner dam 108 and the outer dam 110 so as to be higher than the inner dam 108 and the outer dam 110. Specifically, for example, as shown in FIG. 1, the resin portion 112 is formed over the entire region between the inner dam 108 and the outer dam 110.

The touch sensor includes the plurality of electrodes 114, the wiring 116 to be connected, the wiring, and a part of the driving IC 126, and detects a touched position. The electrode 114 is disposed so as to overlap a sealing film 418 (described later). Specifically, the electrode 114 is disposed so as to overlap the sealing film 418 disposed in the display region 102, and includes a plurality of pairs of a drive electrode and a detection electrode. The plurality of pairs of the drive electrode and the detection electrode are arranged apart from each other in the X direction and the Y direction, and form a mutual capacitance. For example, the drive electrodes are a plurality of diamond-shaped electrodes 114 arranged side by side in the X and Y directions. The plurality of drive electrodes arranged side by side in the X direction are electrically connected to each other by wirings 116 connecting the respective diamond-shaped portions. On the other hand, the plurality of drive electrodes arranged side by side in the Y direction are not electrically connected.

The detection electrode is a plurality of diamond-shaped electrodes 114 arranged side by side in the X and Y directions. The plurality of detection electrodes arranged in the X direction are not electrically connected to each other. On the other hand, the plurality of detection electrodes arranged side by side in the Y direction are electrically connected by the wiring 116 connecting the rhombic portions. The shape of each of the drive electrode and the detection electrode may be a shape other than the rhombus.

A wiring 116 connecting a plurality of drive electrodes arranged in the X direction and a wiring 116 connecting a plurality of detection electrodes arranged in the Y direction are formed in different layers (see FIG. 8B). ). Thus, the drive electrode and the detection electrode are formed so as not to be electrically connected. Further, the pair of the drive electrode and the detection electrode is arranged close to each other so that each of them becomes an electrode of a capacitor to form a capacitance.

(4) The electrode 114 is formed in a mesh shape. Specifically, the hole provided in the electrode 114 is arranged at a position overlapping with a region from which light is emitted so that the electrode 114 does not block light emitted from the pixel. By forming the electrode 114 in a mesh shape, the electrode 114 can be formed using a metal having low electric resistance. In addition, by reducing the electric resistance of the electrode 114, the sensitivity of the touch sensor can be improved.

The lead wiring is electrically connected to the electrode 114 and is arranged in the first peripheral region 104. Specifically, one wiring is arranged for each column and one row of the drive electrode and the detection electrode that are electrically connected. Each lead-out wiring electrically connects the terminal portion 122 and the electrode 114 via the first peripheral region 104 and the second peripheral region 106. The routing wiring is arranged on the inner dam 108, the resin portion 112, and the outer dam 110 in the first peripheral region 104. As shown in FIG. 1, the lead wiring has a first lead wiring 118 and a second lead wiring 120 arranged in different layers, and the first lead wiring 118 and the second lead wiring 120 are connected to the first peripheral region 104. May be connected.

The touch sensor detects the touched position based on the voltage of the detection electrode that fluctuates according to the signal input to the drive electrode. Specifically, a drive signal is input to the drive electrode. The voltage of the detection electrode changes according to the drive signal via the capacitance. The touch sensor detects a touched position based on a voltage change of the detection electrode.

The FPC 124 is connected to the terminal unit 122. The FPC 124 is formed of a resin and has flexibility.

The drive IC 126 is disposed on the FPC 124 and supplies power and signals to circuits formed in the touch sensor and the display area 102. Specifically, for example, the drive IC 126 applies a potential for conducting between a source and a drain to a scanning signal line of a pixel transistor arranged corresponding to each of a plurality of sub-pixels forming one pixel. At the same time, a current corresponding to the gradation value of the sub-pixel flows through each pixel transistor data signal line. With the driving IC 126, the display device 100 displays an image in the display area 102. Further, the drive IC 126 generates a signal to be input to the drive electrode, and detects the touched position based on the voltage of the detection electrode.

FIG. 2 is a schematic diagram schematically showing a pixel circuit and a peripheral circuit included in the display device 100. The display device 100 includes a pixel array unit 4 that displays an image, and a driving unit that drives the pixel array unit 4.

(4) In the pixel array section 4, the organic light emitting diodes 6 and the pixel circuits 8 are arranged in a matrix corresponding to the pixels. The pixel circuit 8 includes a lighting TFT (thin film transistor) 10, a driving TFT 12, a capacitor 14, and the like.

On the other hand, the driving unit includes the scanning line driving circuit 20, the video line driving circuit 22, the driving power supply circuit 24, and the control device 26, drives the pixel circuit 8, and controls the light emission of the organic light emitting diode 6.

The scanning line driving circuit 20 is connected to a scanning signal line 28 provided for each horizontal row of pixels (pixel row). The scanning line driving circuit 20 sequentially selects the scanning signal lines 28 according to the timing signal input from the control device 26, and applies a voltage for turning on the lighting TFT 10 to the selected scanning signal lines 28.

The video line drive circuit 22 is connected to the video signal lines 30 provided for each of the vertical arrangement of pixels (pixel columns). The video line driving circuit 22 receives a video signal from the control device 26 and, in accordance with the selection of the scanning signal line 28 by the scanning line driving circuit 20, applies a voltage corresponding to the video signal of the selected pixel row to each video signal line 30. Output to The voltage is written to the capacitor 14 via the lighting TFT 10 in the selected pixel row. The driving TFT 12 supplies a current corresponding to the written voltage to the organic light emitting diode 6, whereby the organic light emitting diode 6 of the pixel corresponding to the selected scanning signal line 28 emits light.

The driving power supply circuit 24 is connected to a driving power supply line 32 provided for each pixel column, and supplies a current to the organic light emitting diode 6 via the driving power supply line 32 and the driving TFT 12 of the selected pixel row.

Here, the lower electrode of the organic light emitting diode 6 is connected to the driving TFT 12. On the other hand, the upper electrode 416 (see FIG. 4) of each organic light emitting diode 6 is constituted by an electrode common to the organic light emitting diodes 6 of all pixels. When the lower electrode 410 (see FIG. 4) is configured as an anode (anode), a high potential is input, and the upper electrode 416 becomes a cathode (cathode) and a low potential is input. When the lower electrode 410 is configured as a cathode (cathode), a low potential is input, and the upper electrode 416 becomes an anode (anode) and receives a high potential.

The display device 100 is a piece obtained by cutting a large plate 300 on which a plurality of the display devices 100 are arranged. Specifically, as shown in FIG. 3, a plurality of display devices 100 are arranged on one large plate 300 before being separated. As described later, the display device 100 is formed by forming a circuit in the display area 102 in a state of the large plate 300 and then cutting the circuit. Therefore, a part of the outer edge of the first peripheral region 104 becomes a cut surface of the large plate 300.

Next, a cross section of the display device 100 will be described. FIG. 4 is a diagram showing a cross section taken along line IV-IV of FIG. FIG. 5 is a diagram showing a VV cross section of FIG. FIG. 6 is a diagram showing a section taken along line VI-VI of FIG. FIG. 7 is a diagram showing a cross section taken along line VII-VII of FIG. FIG. 8A is an enlarged view of 800 part of FIG. FIG. 8B is a view showing a cross section taken along line VIII-VIII in FIGS. 1 and 8A. Note that FIG. 1 illustrates the wiring 116 connected to the plurality of electrodes 114, but FIG. 8A is different in that a first electrode layer 502 and a second electrode layer 422 are illustrated. FIG. 8B is a diagram in which a layer below the sealing flattening film 428 is omitted.

As shown in FIGS. 4 to 8B, the display device 100 includes a substrate 402, a circuit layer 404, a third metal 406, a first planarization film 408, a second planarization film 602, and a resin portion. 112, a lower electrode 410, a rib 412, an EL layer 414, an upper electrode 416, a sealing film 418, a first electrode layer 502, an inter-sensor insulating layer 420, a second electrode layer 422, And a coat 424. 4 to 7, illustration of the spacer 910 and the like shown in FIG. 9 is omitted.

The substrate 402 is formed of a flexible material such as glass or polyimide, for example. The display device 100 can be curved by using a flexible material.

The circuit layer 404 includes an insulating layer, a source electrode, a drain electrode, a gate electrode, a semiconductor layer, a passivation layer 405, and the like on an upper layer of the substrate 402. A transistor is formed using the source electrode, the drain electrode, the gate electrode, and the semiconductor layer. The transistor controls, for example, a current flowing to an EL layer 414 formed in a pixel.

The third metal 406 is disposed on the passivation layer 405 included in the circuit layer 404. Specifically, the third metal 406 is disposed on the passivation layer 405 in the display area 102. Further, the third metal 406 is disposed on the source electrode and the second planarization film 602 in a region of the first peripheral region 104 where the passivation layer 405 is not provided. The third metal 406 disposed in the first peripheral region 104 is exposed at the terminal 122.

(4) The first flattening film 408 is disposed in the display region 102 and the first peripheral region 104. Specifically, the first planarization film 408 is disposed on the circuit layer 404 and the third metal 406 in the display region 102, respectively. The first flattening film 408 disposed in the display region 102 prevents a short circuit between the lower electrode 410 and an electrode included in the circuit layer 404, and also flattens a step formed by a wiring or a transistor disposed in the circuit layer 404. .

{Circle around (1)} In the first peripheral region 104, the first planarization film 408 is separately arranged at two places in the first peripheral region 104. Specifically, as shown in FIGS. 4 to 6, the first planarization film 408 is formed in the first peripheral region 104 so as to be spaced apart from each other at two positions in a cross-sectional view and to be convex. The inner first planarization film 408 of the two first planarization films 408 arranged in the first peripheral region 104 is formed as the inner dam 108 for blocking the sealing planarization film 428. The outer first planarization film 408 is formed as a part of the outer dam 110. Each of the two first planarization films 408 formed in the first peripheral region 104 is formed so as to surround the display region 102 in plan view. Note that the inner dam 108 and the outer dam 110 are desirably formed with a height of 20 μm to 50 μm. The distance between the outer edge of the inner dam 108 and the inner edge of the outer dam 110 is desirably 150 μm or less.

２The second planarization film 602 is disposed in the first peripheral region 104. Specifically, as shown in FIG. 6, the second planarization film 602 is disposed on the passivation layer 405 and the substrate 402 in the first peripheral region 104. The second flattening film 602 prevents disconnection of the third metal 406 disposed above by flattening a lower step.

The resin portion 112 is formed between the inner dam 108 and the outer dam 110 so as to be higher than the inner dam 108 and the outer dam 110. Specifically, as shown in FIGS. 4 to 6, the resin portion 112 is disposed between the inner dam 108 and the outer dam 110 so as to surround the display area 102. The resin portion 112 is formed higher than the inner dam 108 and the outer dam 110. The outer edge of the resin portion 112 on the inner dam 108 side is located above the inner dam 108, and the outer edge of the resin portion 112 on the outer dam 110 side is located above the outer dam 110. The outer edge of the resin part 112 may be located outside the outer dam 110 as long as the outer edge is inside the outer edge of the display device 100.

{Circle around (1)} The resin portion 112 has a concave portion 702 in a region overlapping with the routing wiring in plan view. More specifically, as shown in FIG. 7, the resin portion 112 has the same number of recesses 702 as the number of lead-out wirings. In addition, the resin portion 112 in a region that does not overlap with the routing wiring illustrated in FIG. 4 is formed higher than the resin portion 112 in a region that overlaps with the routing wiring illustrated in FIG. The routing wiring is arranged on the concave portion 702. Although FIG. 7 is a diagram showing a cross section of a side along the Y direction, the concave portion 702 is also provided on a side of the resin portion 112 along the X direction.

The lower electrode 410 is disposed on the first planarization film 408. Specifically, the lower electrode 410 is electrically connected to a source or drain electrode of a transistor formed in the circuit layer 404 through a contact hole formed in the first planarization film 408 in the display region 102. It is formed as follows.

The rib 412 is disposed on the first planarization film 408. Specifically, in the display region 102, the rib 412 is formed so as to surround a region where the EL layer 414 emits light. In addition, as shown in FIG. 6, the rib 412 disposed in the first peripheral region 104 is formed as a part of the outer dam 110.

The EL layer 414 is formed on the lower electrode 410. Specifically, the EL layer 414 is formed on the lower electrode 410 and the end of the rib 412 in the display region 102. The EL layer 414 is formed by stacking a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer. The light emitting layer emits light by, for example, recombination of holes injected from the lower electrode 410 and electrons injected from the upper electrode 416. The hole injection layer, the hole transport layer, the electron transport layer, and the electron injection layer are the same as in the related art, and thus description thereof is omitted. In the present embodiment, the light emitting layer is formed using a material that emits red, green, and blue light.

(4) The upper electrode 416 is formed on the EL layer 414, and causes a light-emitting layer included in the EL layer 414 to emit light by flowing a current between the upper electrode 416 and the lower electrode 410. The upper electrode 416 is formed of, for example, a transparent conductive film including a metal such as ITO or IZO, or a light-transmissive metal thin film made of AgMg.

(4) The sealing film 418 is disposed so as to overlap the display region 102 in a plan view. Specifically, the sealing film 418 is disposed so as to cover the entire display region 102 and a part of the first peripheral region 104. The outer edge of the sealing film 418 on the second peripheral region 106 side is located on the resin portion 112 or the outer dam 110.

The sealing film 418 includes a lower barrier film 426, a sealing flattening film 428, and an upper barrier film 430. Specifically, the lower barrier film 426 is formed so as to cover the upper electrode 416 in the display region 102. The sealing flattening film 428 is disposed inside the inner dam 108 so as to cover the lower barrier film 426. The sealing flattening film 428 flattens unevenness of the lower barrier film 426. The upper barrier film 430 is formed so as to cover the lower barrier film 426 and the sealing flattening film 428. The lower barrier film 426 and the upper barrier film 430 are formed of an inorganic material that does not transmit moisture, such as SiN. The sealing flattening film 428 is formed of, for example, acrylic or epoxy. The sealing film 418 can prevent deterioration of the EL layer 414 due to entry of moisture into the EL layer 414. Note that the sealing film 418 is not limited to the above structure, and may be a single layer or two layers, or may be configured by four or more layers.

The outer edges of the lower barrier film 426 and the upper barrier film 430 on the second peripheral region 106 side are located on the resin portion 112 or the outer dam 110. In FIG. 4, the outer edges of the lower barrier film 426 and the upper barrier film 430 on the second peripheral region 106 side are located on the resin portion 112.

The first electrode layer 502 is disposed on the sealing film 418. Specifically, the first electrode layer 502 is the wiring 116 that electrically connects the plurality of electrodes 114 arranged in the Y direction. Further, as shown in FIG. 8B, the first electrode layer 502 is electrically connected to the second electrode layer 422 through a contact hole 802 provided in the inter-sensor insulating layer 420. The first electrode layer 502 receives a drive signal or outputs a detection signal through the second electrode layer 422. As shown in FIG. 8B, the first electrode layer 502 provided in a region where the connecting wiring 116 overlaps in plan view electrically connects the electrodes 114 arranged side by side in the Y direction. Note that the second electrode layer 422 connected to the first electrode layer 502 is a part of the routing wiring. FIG. 4 is a cross-sectional view of a region where the first electrode layer 502 is not arranged.

間 The inter-sensor insulating layer 420 is disposed on the first electrode layer 502. Specifically, as shown in FIGS. 4 to 6, in a region where the first electrode layer 502 is not disposed, the inter-sensor insulating layer 420 is disposed so as to cover the sealing film 418. The inter-sensor insulating layer 420 is disposed so as to cover the first electrode layer 502 except for a region where the contact hole 802 is provided (see FIGS. 5, 6, and 8B). Further, as shown in FIG. 8B, in a region where the connecting wirings 116 overlap in a plan view, the drive electrode and the detection electrode (the first electrode layer 502 and the second electrode layer 422) are formed by the inter-sensor insulating layer 420. Are formed so as not to be electrically connected.

The second electrode layer 422 is disposed on the inter-sensor insulating layer 420. Specifically, as shown in FIG. 4, the second electrode layers 422 are disposed on the inter-sensor insulating layer 420 at regular intervals. The gap where the second electrode layer 422 is not disposed corresponds to a hole of the mesh. In addition, as shown in FIGS. 5 and 6, in a cross-sectional view in a region formed to extend in the X direction, the second electrode layer 422 is formed without a break. Further, as shown in FIG. 8B, the second electrode layer 422 provided in a region where the connecting wiring 116 overlaps in plan view electrically connects the electrodes 114 arranged side by side in the X direction.

では As shown in FIGS. 8A and 8B, in a region where the connecting wirings 116 overlap in plan view, the connecting wirings 116 are arranged in different layers. The wiring 116 to be connected includes the first electrode layer 502 and the second electrode layer 422.

The overcoat 424 is formed on the sealing film 418. The overcoat 424 protects each layer disposed below.

Next, the display device 100 in a curved state will be described. FIG. 9 is a diagram showing a schematic cross section of the display device 100 in the vicinity of the second peripheral region 106. As shown in FIG. 9, the display device 100 includes a substrate 402, a protective film 902, a polarizing plate 904, a reinforcing film 906, a heat diffusion sheet 908, a spacer 910, an FPC 124, and a reinforcing resin 912. Including.

The substrate 402 is curved in the second peripheral region 106. Note that layers such as the circuit layer 404 and the sealing film 418 are arranged over the substrate 402, but are not illustrated in FIG.

The protective film 902 is disposed on the substrate 402. The protective film 902 is a film that protects each layer disposed on the substrate 402.

The polarizing plate 904 reduces reflection of external light incident on the display device 100. Thereby, the visibility of the display device 100 is improved.

The reinforcing film 906 is a film for reinforcing the display device 100. The reinforcing film 906 is arranged in flat regions on the front and back surfaces of the display device 100 in a curved state.

The heat diffusion sheet 908 is a sheet for diffusing the heat of the display device 100. Specifically, the heat diffusion sheet 908 diffuses heat generated in a drive circuit arranged around the display device 100 to the entire display device 100. This prevents a state where only a part of the display device 100 becomes high in temperature.

The spacer 910 is arranged between the front-side portion and the rear-side portion of the folded display device 100. The spacer 910 keeps the distance between the front side portion and the back side portion at a certain value or more. Accordingly, even when pressure in the thickness direction is applied to the display device 100, the curvature of the second peripheral region 106 is kept within an allowable range.

{Circle around (2)} The end of the spacer 910 is formed to have a curved surface having a curvature corresponding to the back surface of the second peripheral region 106. By bringing the end of the spacer 910 into contact with the back surface of the second peripheral region 106, the shape of the second peripheral region 106 can be kept constant even when pressure is applied to the surface of the second peripheral region 106. With the spacer 910, stress applied to the wiring arranged in the second peripheral region 106 can be reduced, and disconnection of the wiring can be suppressed.

The FPC 124 is connected to the terminal section 122 of the substrate 402. In the FPC 124, a driving IC 126 for controlling lighting of a pixel is arranged.

The reinforcing resin 912 is a resin for reinforcing the display device 100. The reinforcing resin 912 is disposed in the second peripheral region 106 of the display device 100 in a curved state. The reinforcing resin 912 is applied to the bent region of the display device 100.

In addition, a configuration in which the reinforcing resin 912 is not attached to the second peripheral region 106 may be adopted. According to this configuration, the flexibility of the second peripheral region 106 can be increased, and the display device 100 can be curved with a smaller radius of curvature. As the radius of curvature of the second peripheral region 106 decreases, the size of the folded display device 100 in plan view also decreases, and the thickness of the folded display device 100 also decreases.

As described above, according to the present invention, the outer edge of the sealing film 418 on the side of the second peripheral region 106 is located above the resin portion 112 or the outer dam 110. That is, the sealing film 418 is not disposed on the cut surfaces of the second peripheral region 106 and the large plate 300. Accordingly, it is possible to prevent the sealing film 418 from cracking due to the curvature of the display device 100 or the cutting of the large plate 300. Therefore, it is possible to prevent the moisture from invading through the cracks in the sealing film 418 as an intrusion path, thereby preventing the display element from deteriorating.

カバー As a modification of the above embodiment, a cover resin 1002 may be provided on the resin portion 112. FIG. 10A is an enlarged plan view of a left end portion of a display device 100 according to a modification. FIG. 10B is a diagram showing a XX cross section of FIG. FIG. 10C is a diagram showing a cross section taken along the line X′-X ′ in FIG. As shown in FIGS. 10B and 10C, when the mask 1302 (see FIG. 13) is disposed on the upper surface of the resin portion 112, the upper surface of the resin portion 112 may be damaged. In this modification, a cover resin 1002 is provided on the resin portion 112 in order to smooth unevenness due to the scratch.

Specifically, as shown in FIGS. 10A to 10C, the cover resin 1002 is disposed between the inner dam 108 and the outer dam 110 so as to cover the entire resin portion 112. One recess 702 is provided for each first routing wiring 118. Since the lower layer of the first wiring 118 is flattened by the cover resin 1002, disconnection of the first wiring 118 due to unevenness of the scratch can be prevented.

FIG. 11A is a plan view in which a left end portion of a display device 100 according to another modification is enlarged. 11B is a diagram showing a cross section taken along the line XI-XI of FIG. FIG. 11C is a diagram showing a cross section taken along the line XI′-XI ′ of FIG. In this modification, the cover resin 1002 is disposed between the inner dam 108 and the outer dam 110 so as to cover the entire resin portion 112 except for the region where the concave portion is provided.

(4) One recess 702 is provided for each of the plurality of first routing wirings 118. In the example shown in FIG. 11A, two concave portions 702 are provided. The first routing wiring 118 is arranged so as to pass through a region where the concave portion 702 is provided. In the example shown in FIG. 11A, two first wirings 118 are arranged in the upper concave portion 702, and three first wirings 118 are arranged in the lower concave portion 702.

では In this modification, the mask 1302 is arranged on the upper surface of the cover resin 1002. With the cover resin 1002, the depth of the concave portion 702 can be increased. Therefore, when the mask 1302 is disposed on the upper surface of the cover resin 1002, the mask 1302 can be prevented from contacting the surface of the resin portion 112 and causing the surface of the resin portion 112 to have unevenness. Therefore, since the lower layer of the first routing wiring 118 becomes flat, disconnection of the first routing wiring 118 due to unevenness of the scratch can be prevented.

The arrangement layout of the first routing wiring 118 and the concave portion 702 is not limited to the modified example, and may be applied in the above embodiment. Further, the number of the concave portions 702 and the number of the first lead-out wirings 118 arranged in one concave portion 702 are not limited to the above.

Next, a method for manufacturing the display device 100 will be described. FIG. 12 is a flowchart illustrating a method of manufacturing the display device 100. First, each layer from the circuit layer 404 to the lower electrode 410 is formed (S1202). Since this step is the same as in the related art, detailed description will be omitted.

Next, the dam agent is patterned (S1204). Specifically, after the dam agent is disposed over the entire display region 102 and the curved region 106, the first flattening film 408, the inner dam 108, and the region other than the region where a part of the outer dam 110 is formed. Is removed. Thereby, the first planarization film 408, the inner dam 108, and a part of the outer dam 110 are formed. The dam agent may be formed in the same shape as described above from the beginning by applying a dam agent or the like.

Next, layers from the third metal 406 to the upper electrode 416 are formed (S1206). Here, a part of the rib 412 is formed as another part of the outer dam 110.

Next, the resin part 112 is formed (S1208). Specifically, the resin portion 112 is formed by applying a resin material and then irradiating ultraviolet rays to cure the resin material. The resin portion 112 may be formed by another method as long as it fills the space between the inner dam 108 and the outer dam 110 and is formed higher than the inner dam 108 and the outer dam 110.

Next, the mask 1302 is arranged on the resin part 112, and the sealing film 418 is formed (S1210). Specifically, as shown in FIG. 13, mask 1302 is arranged in contact with resin portion 112. The mask 1302 has an opening in a region where the sealing film 418 is formed. Then, the lower barrier film 426 is formed at a position corresponding to the opening of the mask 1302 by the CVD method. After the liquid resin material is disposed in the display region 102, the sealing flattening film 428 is cured by being irradiated with ultraviolet rays. Here, since the liquid resin material is blocked by the inner dam 108, the sealing flattening film 428 is formed inside the inner dam 108. The upper barrier film 430 is formed at a position corresponding to the opening of the mask 1302 by the CVD method similarly to the lower barrier film 426.

Next, after the mask 1302 is removed, the cover resin 1002 is formed (S1212). When the mask 1302 contacts the resin portion 112 in S1210, the upper surface of the resin portion 112 may be damaged. The cover resin 1002 is arranged in a region where the mask 1302 is in contact.

Next, the individual pieces of the display device 100 are cut out from the large plate 300 (S1214). Individual pieces of the plurality of display devices 100 are cut out from one large plate 300. Here, since the sealing film 418 is formed using the mask 1302 in S1208, the sealing film 418 does not exist on the cut surface.

Next, the cut-out display device 100 is curved (S1216). Specifically, after the polarizing plate 904, the protective film 902, and the reinforcing film 906 are attached, the display device 100 is curved while the spacer 910 is pressed. Thus, the display device 100 is in the state shown in FIG. Here, since the sealing film 418 is formed using the mask 1302 in S1208, the sealing film 418 does not exist in the curved region (the second peripheral region 106).

According to the present invention, the sealing film 418 is formed by the CVD method using the mask 1302. Since the outer edge of the sealing film 418 can be accurately controlled, the sealing film 418 can be prevented from being disposed on the cut surface of the second peripheral region 106 and the large plate 300. Therefore, it is possible to prevent the moisture from invading through the cracks in the sealing film 418 as an intrusion path, thereby preventing the display element from being deteriorated.

As a modification of the above manufacturing method, in S1210, the sealing film 418 may be formed in a state where the mask 1302 does not contact the resin portion 112. Specifically, as shown in FIG. 14, the sealing film 418 may be formed in a state where a gap is provided between the upper surface of the resin portion 112 and the mask 1302. In this case, the sealing film 418 is also formed below the end of the mask 1302, but by using the mask 1302, the outer edge of the sealing film 418 can be controlled more accurately than in the related art. Further, by providing a gap between the mask 1302 and the resin portion 112, the step of providing the cover resin 1002 (S1212) can be omitted.

Within the scope of the idea of the present invention, those skilled in the art can conceive various changes and modifications, and it is understood that these changes and modifications also belong to the scope of the present invention. For example, those skilled in the art may appropriately add, delete, or change the design of the above-described embodiments, or may add, omit, or change the conditions of the process. As long as it is provided, it is within the scope of the present invention.

Claims

A display area for displaying an image,
A first peripheral area disposed outside the display area;
A second peripheral region disposed outside the first peripheral region;
A display device having:
An inner dam disposed in the first peripheral region located between the display region and the second peripheral region;
An outer dam disposed outside the inner dam in the first peripheral region;
Between the inner dam and the outer dam, a resin portion formed higher than the inner dam and the outer dam,
A sealing film disposed so as to overlap the display area in plan view,
Has,
A display device, wherein an outer edge of the sealing film on the second peripheral region side is located on the resin portion or the outer dam.
Further, a touch sensor including an electrode disposed on the sealing film, and a lead wiring electrically connected to the electrode and disposed in the first peripheral region,
The resin portion has a concave portion in a region overlapping with the routing wiring in plan view,
The display device according to claim 1, wherein:
The display device according to claim 1, further comprising a cover resin disposed on the resin portion.
It is a display device of an individual piece obtained by cutting a large plate in which a plurality of the display devices are arranged,
A part of an outer edge of the first peripheral region is a cut surface of the large plate,
The display device according to claim 1, wherein:
A method for manufacturing a display device, comprising: a display area for displaying an image; and a first peripheral area disposed outside the display area,
Disposing a dam agent in the first peripheral region;
Patterning the dam agent to form an inner inner dam and an outer outer dam,
Forming a resin portion higher than the inner dam and the outer dam between the inner dam and the outer dam;
Arranging a mask having an edge on the resin portion, and forming a sealing film in the display region;
Curving the display device in a region outside the first peripheral region;
A method for manufacturing a display device, comprising:
The method according to claim 5, further comprising the step of cutting out individual display devices from the large plate on which the display devices are formed.
6. The method according to claim 5, wherein the mask is disposed in contact with the resin portion.
The method according to claim 7, further comprising a step of forming a cover resin on the resin portion.